反应详情

3-[1-(tert-Butoxycarbonyl)amino-1-cyclopropyl]methyl-1-[1-(R)-phenylethyl]pyrrolidine (1.234 g, 3.582 mmol) was dissolved in dry dichloromethane (20 ml) to which, under ice cooling, was subsequently added dropwise benzyl chloroformate (1,278 μl, 8.955 mmol). After 8 hours of stirring at room temperature, the reaction solution was concentrated under a reduced pressure. The thus obtained residue was subjected to a flash silica gel chromatography, and 959 mg (71.5%) of the title compound was obtained from an eluate of n-hexane:ethyl acetate=2:1 as a colorless oil component.

1. concentrationthe reaction solution was concentrated under a reduced pressure